Spindle-bearing for engraving-machines.



(Application filed Jan. 20, 1902.)

(No Mqdel.)

UNITED STATES- PATENT ()FFIGE.

CHRISTIAN RUDOLF JA Y, OF LEIPSIO, GERMANY.

SPlNDLE-BEARING FOR ENGRAVlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 705,674, dated July 29, 1902.

7 Application filed January 20, 1902. Serial No. 90,389- (No model.) I

To all 1071 0121, it may concern:

Be it known that I, CHRISTIAN RUDOLF J AY,

a citizen of Germany, and a resident of Leipsic, Germany, have invented certain new and useful Improvements in Spindle-Bearings for Engraving-Machines, of which the following is a specification.

This invention relates to an improved bearing for the spindles of relief, reducing, or other engraving-machines in which any axial displacement of the tool owing to changes in temperature is prevented. For obtaining clean work the spindle must be accurately journaled in such a manner that any play between work-piece and tool owing to an axial displacement of the spindle is prevented. Such a play will cause the formation of ridges in the work-piece, which must be gone over by hand, so that not only much time is consumed, but the character of the work is frequently impaired. If the axial displacement is prevented by collars fitted upon the spindle, an expansion or contraction of the latter will either cause a play or a jamming between the collars and the bearing. A play will produce the objectionable ridges on the work-piece, while jamming will cause the bearings to run hot.

By my invention theabove objections are overcome and the tool will always engage the work properly.

The drawing represents a longitudinal section of my improved bearing for engravingmachines.

The letter L represents a rest or slide having a front and rear bearing G G in which is journaled the spindle S. This spindle is provided at its front with a head S, carrying the engraving-tool S such head being received within a front socket G of rest L.

Upon the rear threaded end of the spindle are mounted the nuts M, that form the abutment for one end of a coiled spring F, surrounding the' spindle. The other end of spring F bears against a diskB, movable upon spindle S and received within a rear socket G of rest L. The spindle S is driven from a pulley S mounted upon the same between the bearings G G The spring F tends to draw the spindle S backward, so that its head S will always impinge against the base of socket G If the spindle is expanded, the spring will correspondingly distend, and if the spindle co11- tracts the spring will be correspondingly come pressed. In this way the rear end of the spindle is free to expand and contract, while the point of the engraving-tool will always remain in one and the same working plane.

What I claim is In an engraving-machine, the combination of a rest having a pair of bearings and a front socket, with a headed tool-spindle mounted in the bearings, a nut and disk mounted upon the rear end of the spindle, and aspring between the nut and disk which is adapted to draw the tool-head against the base of the front socket, substantially as specified.

Signed by me at Leipsic, Germany, in presence of two witnesses, this 21st day of November, 1901.

CHRISTIAN RUDOLF JAY. 

